package ltd.dujiabao.commonutils;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jws;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import org.springframework.util.StringUtils;

import javax.servlet.http.HttpServletRequest;
import java.util.Date;

/**
 * @author : DuJiabao
 * @Project : online-course-project
 * @Time : 2021/4/24 14:32
 * @Desc :
 */
public class JwtUtils {
  public static final long EXPIRE = 1000 * 60 * 60 * 24;  // 存活时间
  public static final String APP_SECRET = "ukc8BDbRigUDaY6pZFfWus2jZWLPHO"; // 签名哈希

  public static String getJwtToken(String id, String nickname) {

    return Jwts.builder()
            // 设置jwt头内容
            .setHeaderParam("typ", "JWT")
            .setHeaderParam("alg", "HS256")
            .setSubject("guli-user")
            .setIssuedAt(new Date())  // 设置存活时间
            .setExpiration(new Date(System.currentTimeMillis() + EXPIRE))
            // 设置有效载荷，也就是存储的用户信息
            .claim("id", id)
            .claim("nickname", nickname)
            // 签名哈希
            .signWith(SignatureAlgorithm.HS256, APP_SECRET)
            .compact();
  }


  /**
   * 判断token是否存在与有效
   *
   * @param jwtToken
   * @return
   */
  public static boolean checkToken(String jwtToken) {
    if (StringUtils.isEmpty(jwtToken)) return false;
    try {
      Jwts.parser().setSigningKey(APP_SECRET).parseClaimsJws(jwtToken);
    } catch (Exception e) {
      e.printStackTrace();
      return false;
    }
    return true;
  }

  /**
   * 判断token是否存在与有效
   *
   * @param request
   * @return
   */
  public static boolean checkToken(HttpServletRequest request) {
    try {
      String jwtToken = request.getHeader("token");
      if (StringUtils.isEmpty(jwtToken)) return false;
      Jwts.parser().setSigningKey(APP_SECRET).parseClaimsJws(jwtToken);
    } catch (Exception e) {
      e.printStackTrace();
      return false;
    }
    return true;
  }

  /**
   * 根据token获取会员id
   *
   * @param request
   * @return
   */
  public static String getMemberIdByJwtToken(HttpServletRequest request) {
    String jwtToken = request.getHeader("token");
    if (StringUtils.isEmpty(jwtToken)) return "";
    Jws<Claims> claimsJws = Jwts.parser().setSigningKey(APP_SECRET).parseClaimsJws(jwtToken);
    Claims claims = claimsJws.getBody();
    return (String) claims.get("id");
  }
}
